How to open the multiple .db file and insert all the rows of tables in live database using codeigniter php

I have multiple this.db file in a folder which i want to open every one and insert the tables rows in to my live database as sync process. i can do for only one db file using construct but when i use for each it does not works for multiple db file.this.db file is the sqlite database file that i upload from android app.Please help me here. Thanks in Advance.